Why is it better to buy locally-produced agricultural products instead of nationally-produced big-name brands?

Imagine that you have recently been hired by the Pennsylvania Department of Agriculture and are part of the PA Preferred Program.  The Secretary of Agriculture explains that your main job is encouraging people to buy locally-produced Pennsylvania products.  A local media service has offered you the opportunity to either write a short essay or produce a short video documentary that can be used to educate the public about why it is better to buy locally produced products.  In 350-500 words, give many reasons for buying Pennsylvania and Berks County products as possible.